The macro does not list those bb stored in building blocks templates. It shows them from normal.dotm and loaded Add-Ins (and presumably the attached template). It lists templates that have no building blocks. I am in the process of trying to write one that will get them all, but don't hold your breath I am somewhat of a tyro when it comes to coding and I do have a day job.

If you want Alan Wyatt's macro to list your custom buliding blocks stored in Building Blocks.dotx, load that file temporarily as an Add-In. It will then be a member of the vba templates collection in Word.